A268028 Number of 4Xn 0..2 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value.

63, 3969, 250047, 13530274, 687233742, 32747526923, 1486191908610, 64725260937166, 2722665554883854, 111163751115106132, 4422667685678114786, 172002220213857351197, 6556076286013521999466, 245446300682062937711088

Offset

1,1

Comments

Row 4 of A268026.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=2
..1..1....2..1....1..1....0..0....2..1....2..2....1..0....2..1....0..0....1..2
..2..0....2..1....2..2....2..2....1..2....0..1....0..0....1..0....0..0....2..1
..1..1....0..2....2..1....0..1....2..0....1..2....1..1....0..2....2..1....2..2
..1..1....2..2....1..1....0..0....2..1....2..0....1..0....1..0....1..0....1..1

Crossrefs

Cf. A268026.

Sequence in context: A258684 A180926 A267963 * A194484 A195620 A238994

Adjacent sequences: A268025 A268026 A268027 * A268029 A268030 A268031

Keyword

nonn

Author

R. H. Hardin, Jan 24 2016

Status

approved